Melanie Griffith, 54, says she was finally able to kick her addiction to prescription pain pills after her daughters intervened. "It takes what it takes and you'll know when you know," she said when asked about her sobriety—and for her, this "tipping point" occurred three years ago during a conversation with her daughters Dakota, 22, and Stella, 16. "They were the ones who said, 'You really need to get help,' and I heard them and knew what they meant," says the actress, who went to rehab for three months and has been sober ever since. "I couldn't have done it without them." Griffith's husband, Antonio Banderas, recently said his wife was "an unbelievable lion fighting" her addiction, which began with a knee injury. The actor even credited her addiction with helping them maintain their marriage, saying he and the couple's three kids participated in her recovery, including attending group therapy sessions together. As far as her multiple relapses in the past, she says, "it doesn't mean that I'm stupid. It's just that that's what the disease is."